Intake runners.
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Cross-Country
Joined: Mar 2021
Posts: 57
Likes: 6
From: australia
Intake runners.
My ford f150 351w with 5 speed manual is nearly back from the shop with big changes.
The cam chewed up some lifters after 15000 Kms and they suspect it wasn't run in properly. After many attempts to fix the bucking and surging I have ditched the EFI.
It now has a 600 Holley vac sec, Edelbrock performer RPM intake , long tube headers and stock reman heads which I think are e7 heads. The cam going in is a RV cam flat tappet w/hich I don't know the details yet but its hard to get hold of one at the moment.
The pistons are KB hyper flat tops with 12cc valve reliefs.
So my question s are what size combustion chamber and what size intake runners.
Down here in Oztralia I have Edelbrock and AFR heads to choose from and so so would 165,170 runners be the best or 185,190.
And what sort of compression would I have with the aforementioned pistons give me ?
Thanks for any help
The cam chewed up some lifters after 15000 Kms and they suspect it wasn't run in properly. After many attempts to fix the bucking and surging I have ditched the EFI.
It now has a 600 Holley vac sec, Edelbrock performer RPM intake , long tube headers and stock reman heads which I think are e7 heads. The cam going in is a RV cam flat tappet w/hich I don't know the details yet but its hard to get hold of one at the moment.
The pistons are KB hyper flat tops with 12cc valve reliefs.
So my question s are what size combustion chamber and what size intake runners.
Down here in Oztralia I have Edelbrock and AFR heads to choose from and so so would 165,170 runners be the best or 185,190.
And what sort of compression would I have with the aforementioned pistons give me ?
Thanks for any help
Cargo Master
Joined: Oct 2020
Posts: 2,641
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I never can remember if Ford runners are smaller or larger average cross sectional area than a Chevrolet small block for a given volume. With that said I would use the smaller runner for a pickup application with a short duration cam, 351 cubic inches and a realistic max rpm of 5000 or less.
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Cross-Country
Joined: Mar 2021
Posts: 57
Likes: 6
From: australia
Thanks Dave, with regards to compression I just used the summit racing calculator and it came up with 9.02 to 1 ratio.
does that seem correct
4.02 bore 3.5 stroke 58cc chamber and the block was decked when rebuilt and I put down 0.1 for gasket.
It has kb flat tops with 12cc reliefs.
Thats if I go with the AFR heads.
does that seem correct
4.02 bore 3.5 stroke 58cc chamber and the block was decked when rebuilt and I put down 0.1 for gasket.
It has kb flat tops with 12cc reliefs.
Thats if I go with the AFR heads.
Cargo Master
Joined: Oct 2020
Posts: 2,641
Likes: 771
I don't what an E7 head actually has for chamber volume. If you're figuring with a .030 gasket what are you using for a gasket bore size? It might be 4.100 or 4.125. If the calculator uses the bore size for the gasket bore size that can throw it off quite a bit sometimes.
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Cross-Country
Joined: Mar 2021
Posts: 57
Likes: 6
From: australia
that's the thing I haven't a clue. just going off the summit racing calculator. looked up head gasket thickness and the average seemed to be 0.030.
I have read that the E7s have between 62 and 64 cc . as for deck height I don't know what happens when the block is decked.
I assume you would get more compression.
I have read that the E7s have between 62 and 64 cc . as for deck height I don't know what happens when the block is decked.
I assume you would get more compression.
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Cargo Master
Joined: Oct 2020
Posts: 2,641
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You do get more compression when the block is decked if everything else stays the same but here's where it can get interesting. Let's say that you want to end up with .040 distance between the flat part of the piston and the flat part of the deck. If the engine is cut to give zero deck clearance and the piston top is even with the top of the block the builder would have to use a .040 gasket to get .040 clearance, simple. BUT if the builder is trying to get the maximum amount of compression with a given set of parts it is better to have the piston stop down in the cylinder let's just say .020. Now a .020 gasket can bet used to get .040 clearance. The compression ratio won't be the same because the gasket bore is larger than the cylinder. In the first example that larger bore is .040 thick but in the 2nd example it is only .020. The total volume and the unswept volume is lower on example #2 and that will give it a higher compression ratio.
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